Local Mirror - Wiki - help please

Question

Hello peoples,
I have read and followed the Wiki on having a local mirror  http://wiki2.archlinux.org/index.php/Local%20Mirror
My updates do not occur automatically, and I do not have the knowledge yet to fix this so I was wondering if there is a better way of doing this.  I have read Man:crond and crontab but am left a little confused as to how this can be incorporated into using the original script.  Also I would like to automate the time to 0200HRS.   Can somebody help me out please?   

Answer 1

Thankyou for your reply i3839,
From your answer, I can define more clearly what the issue is.  The updating I was refering to was only the ¨Current¨ and ¨Extra¨ database that I sync.  The script given in the wiki didn´t work for me so here is my version that works for me.
#!/bin/sh
rsync -avz --delete rsync.archlinux.org::ftp/current/os/i686/ /home/mirror/current/os/i686
rsync -avz --delete rsync.archlinux.org::ftp/extra/os/i686/ /home/mirror/extra/os/i686
# rsync -avz --delete rsync.archlinux.org::ftp/testing /mirror/
# rsync -avz --delete rsync.archlinux.org::ftp/unstable /mirror/
The two issues I have are:
1. the script does not run automatically via cron.daily/sync file, yet when I click on the sync.sh file it works. 
2. The updates occur at 0002hrs, which I would like to change to 0200hrs instead
cron.daily/sync:
!/bin/sh
SYNCLOGFILE="/var/log/sync.log"
SYNCLOCKFILE="/var/lock/sync.lock"
if [ -f $SYNCLOCKFILE ]; then
# lock file already present, bail
exit 1
fi
echo -n ">>> Sync log for " > $SYNCLOGFILE
date >> $SYNCLOGFILE
cd /home/mirror
touch $SYNCLOCKFILE
su - evan -c "/home/mirror/sync.sh" >> $SYNCLOGFILE
rm -f $SYNCLOCKFILE
Also, the sync.log and sync.lock files have not been created. Is this a permissions issue and if so how do I fix it?
Cheers